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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abd925360545aad8ce378ac60cde90f2f46cb15b3e030c705072c6dcbbd8414' 
  AND token = 'Krg4Pu6K0JolGFH7zexuBe8NHvgEmh7D3+Dm2sGGwEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}