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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b124dbf672f493d68a5de5babad888a04973124d885a475a19c85ce4de2ce2' 
  AND token = 'L5iw0Z1mtVWABGrfLoyp8kzU9OQotlMAGqZB4+c6v2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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