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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60dc78192e88373af49df1aefbf5e69c9be5d207efa79ea6a05eb6bd7f9f060' 
  AND token = 'Fnh1jEzBL+h11+ZyGRL66nSAA4vuk0U1qNeM55kgsJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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