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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4d46c93cf7836f0f8bdac42cdc49a87f12ed8bc78198444de2358a2e37a362' 
  AND token = '36Vw4q7BwpdNd7aw6Mcwxyi6M5kQectPIC746/jHBW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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