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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b874bc852b64ac8e955e46f4e7b0a8c7cd26dcc2419fc1d5fbe99f8e1d6e32d' 
  AND token = 'RR2I15ABTpkXCuxduvCU0slxap8Uy+FJkR5gPK07sbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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