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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e08ae562cbc6113c06c92a050dfda31e6f074c820dd54ae346a41eb9aa87a97' 
  AND token = 'QQ5ef3nCT0dIi4swnllgHjAhxm3iR2ol+f5u5eYLP8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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