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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f191b7b7ee081d58cec7b81cc158b52e8cfc670981e591766b8dfe111cc8838a' 
  AND token = 'IRpbx8ivwojMDYuPSCyj3deiiGpm4qg15fj34wxvnCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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