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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f7972d9d73844a55a9fde2cab2147b26040a2e145e6e9e370ab497adab0f07' 
  AND token = '6aZPr+UrciEbccgoO/ETECYvIp4jUfqr1VmbFFWK1+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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