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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02dce891f874c4072b9dc88d15c27b5ebd4398e2367301b73de4e0f8e13be949' 
  AND token = '+o3VL40+q4HN96M8GgrwobDX5FRb86yGduOpmTHkajg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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