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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693e686e5cd4dc8af3f717f8a0c011e99768037936447453e92850f8c13f4e66' 
  AND token = 'nsvZetnSV2bR1AwtnvBtQd/tvI4EsHtLm7pJfiRdbSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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