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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02749e03000febb5cfbb78c93d8e5711673e747b48a72a035477b0db8ab50628' 
  AND token = '3Zg90uzgRUFc1Nm+h7wFltf1w1y0779rvZKNSs7W74g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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