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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab027d820da09015ca87ba18886aaf373ff7fe688c1a08c9ed84d50f96389e0f' 
  AND token = 'j+lahQHFO1Vz/XNF5lVwFO5DMovB3oEv3geEjNKzu54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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