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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b70f77e694e82d133ef64d52e944fffac4bfdd65674750c5078c0a4dd29b4e9' 
  AND token = 'pXfP2Qo2W9KIXwbkGKAWsKqn437IhF1/VzSalN14lo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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