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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e15080f475d99d00001887cdf298e3a793a22bd5e5ba973dc0b8f923abca0f' 
  AND token = 'BMgj3sQFpZXXva7wapl1mszcoc8Af83h9IcZiOTTbS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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