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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a42ad4e6d60d60e96b30da2501a73d52c386b14c29094cbc3fd66d83c6b60fb' 
  AND token = 'le4EhQeF4HAwZllXvvUsnJQ22N08sFLkxzVkpeVurVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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