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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff25d08e2a3a4864e253c5e839b9fef435616da5fc54cdac9ded8fd4a95cfdc1' 
  AND token = '0LNZXbs52k6diFR0MS2oBBUTDN2UzdpZt5aqk286TJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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