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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82455adc0827800d0b97a88f23d835bcd5f91acc94e10711a893d856a09fc4a' 
  AND token = 'OUH/m0PeRzNJZcr24tNHzpqmM4jK/KCQ9FeQEImVZ6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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