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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6c6588b7c147af3dbb7ad2a786b58bb3c125b0e544f93067f2e1b1d8657fec' 
  AND token = 'BXJET6fuGpG57W/3xekh0J1pLc2svogA5dcQaYcOcMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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