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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc15775492ed3811503433d795143b662ec68a544a919ec46e0575cd7085af9' 
  AND token = 'Rara48IbrRbJhfJg26SDxYiYas58+H/c2Cu6MsKWVO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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