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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ecd84fed86b21ef40e04ed1d187405ab83f0e185571ec4e8a9a113bc2f431b' 
  AND token = 'DGqhpzJQtteyJG4AReyrO48Kp4C84AldC+vn7G+2uqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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