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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54991c9d61b2ab95a4d3e765cd73f091c307e2354d9335d301928b567729a8ca' 
  AND token = 'cNVEhT6Z+ypAOIosJKEVJ9Qmc9oRkCp0rW5PndpoVos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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