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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4810f5d7e9a6e5f67e7f9142d4a0ff602c88bcaca4bb3f011bcae11dda5360cf' 
  AND token = '/hobae0oMewS/rReD+dpjKpLNo6zkaCJlUup8/b59UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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