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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44050570a5f10bd1281a062ebeb95c4ed67e414880b1bc508d00783efaaf2f07' 
  AND token = 'UavAt7+qHBSAl+7KMFxXyW/cBlOPimwYHOKLLnyDuaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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