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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb27eacaa33049348e5c7b396fe768b36264a351969740e8f07f68dc084098e' 
  AND token = 'nk9aQ0uSoyOI5Me7fzDAaqnj++TfWeH8iUW0nyq7Zvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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