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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72535225113ed4d3eb7c535bdedddad5e1f1ff44aa3631f73d9f7d4be608f7c1' 
  AND token = '9e/GPBpA4V1yIlJWoaRjWhOsOQEZ/xYdN5E3cRl57p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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