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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba17efebad26564895414e996fd7f4c618fd38d2d53ba486e3d552c0e1c7f14' 
  AND token = 'QeJzbF95uWsTjhB1bV9/Elbad8y/6MNMwuq+y2SEYKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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