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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d360f114a0db857da8642d5c1cf7a04c012a8f96de7e36576b6496187ca286f' 
  AND token = 'pd3JjD/iLl12p/FcDPbXF+eqH3HtPyMQSNT37O2gcRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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