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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980234da1f607f6aa326439ee537e32bc2f05e7720223257e0eb53b73fccbb58' 
  AND token = 'quqOooY9UACh8DePx5F9cXpiG9fCqSpFZom44+CyGog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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