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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e54e1e92b3706ea418811a9f7e1dad2202aa9bfe5a9582ff716c3f3b0932bdd' 
  AND token = '8/jTIvt7zoVNcXH4hYJRdkwYc8W139S6bF1sx3Jpj4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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