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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8df4173f9682bf3661d32aba22492ebfb792d21335b8a401eabaf45a7c6e6ff' 
  AND token = 'w2aOBua8kctghTCUbRyMPjK8Z7WOiXcbqjYP9shhCgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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