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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40a8a55c6af4b887d87b7c346978145c10e96fa5d0ac85972d23ee835a78ed9' 
  AND token = 'dBXwsXsYJGTWSMpdpWCmkfLVWfh081mSO3i0bZLcXp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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