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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abd989bb3e178a67d9b522bccfc030f2c6c07bd94a5b9d9774ca88390c6029a' 
  AND token = '9nbkMwme9rfrv+Hw1H3XTox7UCOS7RQ1DNcoraEdcSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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