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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3929cef983f595124c77a240b4844b7f9112957ae5f25729b1cbaa278a6d8642' 
  AND token = 'LJwgL/tY3p90pfwwHWqnAYeGSJLwXGY1tOiGuu64ts0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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