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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f263291f62968db5dae8c1ef4f71f27e796d80a9cdf07146a84b4a2ad73fee' 
  AND token = 'L51gT8KLCuduVTYvRZItQ0Yqs7NOdaiKhwMITsH1Xh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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