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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4fce17f2496f6cb54fb6a716355637a721a86844f37870683eab353ae6af06' 
  AND token = 'AblUHoMb7HkVn0QgjnCLuCiTf0dO0+8UM9oO5QsNm/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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