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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38bba11b1a85973ce0f8aa06de344ad57275d5bb76eeebf74445edbde243ec75' 
  AND token = '1GlJksjcQ+Btrh9yWkk2N3jlY0Q7m6IwUyP7/n8W/60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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