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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5626ea8bd5cb1960d63f98259bb784cea6a1dd4d0d984a3ebff39be9d65522ef' 
  AND token = 'gzzHi4N5T/9XlTmvoy56uWXYMo+7eJac+ZO3/wUQQbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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