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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb1ece7b44ac73e9c801a1aaa0a9e0dd1d07123646c34a636212d611bd63feb' 
  AND token = 'V700wT2ZManVLDt+lwtxlj7u6LdO64nixFj5AP6CF84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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