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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd50b27e74e1958902fe146349205771a4ba71223b617881476661cd4058305' 
  AND token = '49LetKary456n7Bt0OS7lVdoI6NXl2JtAcxtKA0OQvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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