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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac6f67cb93783fce037e5cd1d93fe37ec5108b5676c961cd08cc1524e0cb3e4' 
  AND token = '5FvUFRaL9VxwQudWd+HUdUoZEEPzGFGR7JQT5vMGn6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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