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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9baeec5ac9886166a1a0c02a105fd307d53a5ad6b2af46c4424bd7f7e7a4ec' 
  AND token = 'Mu1exaJZskhKi0oMXcOBb3McG+2f9EqQKcP8pjrgXME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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