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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54d55be972acda2985ce5d91beb03a0338f5a3f4a16edac728395df37b773bc' 
  AND token = 'aShZ8aGPyIycfSG2/VUzz8FMcJa3sje5F8tdd9QpfsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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