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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696fe610f6486798979b1737dda186fd5b47923c9c3c0bfec0d8839ff1561795' 
  AND token = 'Uz6WlgN2+i24dfGDOs6tIH+ZB3KUPTCyt7c0jHaoDN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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