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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98761ed88f0d2748758dbc430d1144d5209027fa799020c8610c366329217a15' 
  AND token = 'X62onJ4mIKVXllpkWucHDTu0XO0lJx3lze2qxdKuQHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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