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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5793c9c836990960778f796950bf7cbacf0b9edc127a39ce6a5a0f964f4ec65e' 
  AND token = 'r3x6p8gA1EFkgDMmbLn2vuDV20aWPgLDBl6KKHJ50Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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