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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58b637055e5d87d3b197ac8f730260c20953e7374658ca58a81bd054fbf71b3' 
  AND token = '5TMHHh1WkB/fqwaHV8a2S30LTSgETyw1UXtptKcIXZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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