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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0ec020024fceeee995efe2b1175ac8bfbafb7162dce29b30386a3b2ae9f9c2' 
  AND token = '2jIaJ69Lf6snG+pkSdHNWvynQxUrGksRMR8twcC/wws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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