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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029b6fd9d72fb8cf22771ce480fa356d8472be776618f5ef18c2e722473070fe' 
  AND token = 'MbYt2+2/r7U/lo2B8LpxgjsDS4C5X6dxjK4XwVEvEDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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