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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4773acc6d1fe88a91b106cef60a3bbfb1cff51bcc05d9437ed6c2d7b1216707' 
  AND token = 'Rh4k1q0K5vgbZdsPY2ArtEl4EKh8rqK/OzOK0Lxgx9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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