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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f195e39828de6f3a20ca6990714256587c73db1ea75ab97f8e5d6f74e64033b' 
  AND token = 'W9iRP70ffVuHg0R2VwZ7rWhsVSsolZeazKX2qpgkIqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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