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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a83ed177aa1096c440b4dfdc951ac5b6d27e8f15af730c443d8a2ef2bb0d95' 
  AND token = 'GToZdVPbtykRMwlsAvy3ZwhyfstUYPbmWLYLe/OGp+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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