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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf01051e05ab852d17ac90fef6bd98db98624bebb72ca7dfba1a15b67ee01f0' 
  AND token = 'vqjBjxWX0Pwa5+SWbknni8Q1OaYLkKl0a4Lb5QfVV7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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