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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8b7c1784ce85705e9e47c9fc28ef96d0aa1a1468e5ec271d780d39ee797f1e' 
  AND token = 'C00vQ7oCiZsGy/Xw5X3UhBo5yW450cqiYprsvZzwMgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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