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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba23c2a9d85e125257e247d60b50abdd2131c2291dfc8d0c9dd77a2bfaf0a11' 
  AND token = '4Nx8j4G6MXdq6t3XGcJQ89Y4GC3ggUdWJbGmAbQ0dEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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