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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673264d9b76aad8bca6cdf0842ebd8b08602fcc65eddf38e3dd7de66df9d0717' 
  AND token = 'CpYHHYZmC4WoneCDXyWjh7wS8H0ze6HQzcblp9+UFes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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