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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67360426f2d0226be26a29931791e70e0df644ab9b0edd5a56095b1d0c07d3f4' 
  AND token = 'xsxM+3rFCsDszv3NOw6Ln4J0/2YaQ+KveJnfwadySQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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