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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a88dd2438ea9201e30809c569c618c1814d14e9d37a637978ebfa6e161829f' 
  AND token = 'CZQKwCgmE1AbbWXsauHciotAfJQCnok/iYXZfrGTRq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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