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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83a6ed1a1adb809c1e855351c9be23681404770f41568aa47c0db2fe0d62232' 
  AND token = 'AcyFSJJSRMIcHkXnti6ceY4kRwR+P0l5N3Ow+TBdOj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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