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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7aaf6113c170376f5ba101d0deda4b027d7ff5ff16ac1cd6f1ff9b7311e06d' 
  AND token = 'RzYCU+fo2ElSkr6vdKoPmQNsz24tiZ3fF5dHo6k0rZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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